Improvement in cutter-heads for planing-machines



E. BENJAMIN. CUTTER-HEADS Fon HAMM-MACHINES.

No.173,439. Patented Feb.15,1e 7s.

FIG lll FIG-.Il

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UNITED STATES PATENT QEEIcE. l

EDWIN BENJAMIN, 0E oEIcAeo, ILLINOIS.

IMPROVEMENT IN CUTTER-HEADS FOR PLNlNG-MACHINES.

. Specicationforming part of Letters Patent No. 173,439, dated February 15,1876; application lled March 18, 1875.

Illinois, have invented a new and useful Improvement in Cutter-Heads for Planing-Machines, of which the following is a specification:

The object of the present invention is to provide more convenient means for securing knives to cutter-heads used for planing lumber.

v'lhe nature of' the invention consists in the combination of concave caps with dovete-il fastenings for holding the knives to the head.

In the drawings, Figure l is a transverse section of lny improvement in cutter-heads; Figs. 2 and 3 a broken side elevation thereof.

A represent-s a cutter-head constructed on the plan of the cutter-head patented by me September 9, 1873, and .numbered 142,669. In the four sides of this cutter-headare formed dovetailed grooves B to receive the dovetail nuts F,into which the clamping screws or bolts These nuts are independent parts, and when worn can be replaced by new ones, and if the knives be worn out new ones can be used with the old nuts. The knives E are of the same form asthose in the patent referred to. The cap-plates D arehowever,

different, their under sides being concaved out for the purpose of drawing the edges of theA knives closely to the cutter-head, and thus preventing vibration.

The head A is made of metal and plates and knives of steel.

To place the knives E on the cutter-head, put the screws through the cap-plates D and knives E, and turn the nuts F lightly on the screws; then place the nuts-in the grooves B by sliding them in at the end of the cutterllead; after which the. screws are to be turned tightly on the cap-plates and the device is ready for use, and the nuts cannot get out of place.'

1' claim and desire to secure-by VLetters Patent- The combination of the concave cap-plates D, knives E, cutter-headvA, dovetails B, nuts F, and screws (l, as set forth.

the cap- Y EDWIN BENJAMIN.

Witnesses:

G. L. CHAPIN, O H. ADIX. 

